Brake mechanism.



PATENTED FEB. 11, 1908.

- the UNITED'STATES PATENT OFFICE.

HOWARD E. COFFIN, OF LANSING, MICHIGAN, ASSIGNOR TO OLDS MOTOR. WORKS,OF LANSING, MICHIGAN, A CORPORATION OF MICHIGAN.

' BRAKE MECHANISM.

Specification of Letters Patent.

Patented Feb. 11, 1908.

To all whom it may concern:

Be it known that I, HOWARD E. CoFFIN, a citizen of the United States ofAmerica, residing at Lansing, in the county of Ingham and State ofMichigan, have invented certain new and useful Improvements in BrakeMechanism, of which the following is a specification, reference beinghad therein to the accompanying. drawings.

The invention relates to strap or band brakes, and has particularreference tothe means employed for anchoring the brake strap, and forholding. the same out of contact with the rotating head when the brakeis released.

The invention consists in the peculiar construction, arrangement andcombination of arts as hereinafter set forth.

n the drawings, Figure 1 is a sectional side elevation of a brake towhich my improvements are applied; and Fi 2 is a sectional pers ctlveview of the anc ormg means for rake strap.

A is the revoluble brake head, and B the brake strap surrounding thesame. The opposite ends of this brake stra are connected with suitableoperating mec anism, which,

i as shown, comprises a bell-crank lever C, pivoted to one end of thestrap, and connected by a link D to the opposite end.

E is a rod for actuatin the bell-crank C, and F G are s rin s sleevedrespectively upon the rod E an lin D.

H I are nuts engaging threaded ortions of the rod E and link G, and adustable thereon against the tension of the springs F r G for setting upthe brake.

The brake strap isanchored to resist the tor ue of the head A by aconnection interme iate its ends, preferably centrally .between the sameand diametrically o posed to the lever mechanism. This anc or connectionis so constructed and arranged that when the brake strap is released itwill be held out of contact with the revoluble head, and at the sametime will ermit the stra to be drawn into contact wit said head at a loints when the brake is applied. In detail, J is a flan e member riveteor otherwise secured to t e brake strap, and having anupwardly-extending shank K, which passes through a guide bearing L on arigid portion of the frame. On this shank K is also sleeved a spring M,the tension of which, acting against a head N on the shank, normallydraws the member J and strap attached thereto out of contact with themember A. The member J is held from lateral or angular movement by abifurcated rock arm 0, which embraces the same and is pivoted thereto bythe pinP. This rock arm O extendslaterally from the member J in a planeat ri ht angles to the plane of rotation of the bear? itself pivoted tothe stationary frame by the pin Q. Thus, the movement of the strap andmember J towards or from the brake head is guided by the shank K, andthe path of movement is further determined by the rock arm 0, whichprevents movement in the direction of rotation. Such a movement isfurther resisted by stationary bearings R at the opposite ends of therock arm 0, and these-bearings, together with the bearing L, and bearingfor the pin Q, are preferabl formed in a bar or arm of the frame S, whic1 is of channel cross section.

With the construction described, the member J, which supports the brakestrap, is freely movable towards or from the axis of the rotating head,but' its path of movement is absolutely determined by the engagement ofthe shank K with the bearing L, and the connection with the rock arm O.When'the brake strap is tightened about the head A, the thrust 1stransmitted first tothe member J, and then to the rock arm, 0, while theoposed bearin s or cheeklates R will reinorce the root arm O an movementthereof.

Durin the ap lication of the brake, the spring hf will yie d topermit'the center portlon of thebrake strap coming. in contact with thebrake head, but as soon as the ten A, and is prevent angular sion on thestra is released this spring will again retract t e member J and strapattached thereto, so that the latter will be held out of contact withthe head.

What I claim as my invention is 1. The combination with a revolublebrake head and a brake stra surrounding the same, of an anchor for sairbrake strap movable towards or from the axis of the head, and means forpreventing angular movement of said anchor, and for receivin the thrusttherefrom. comprising parallel Iaterally extending bearings uponopposite sides of the anchor.

2. The combination with a revoluble brake head and a brake strapsurrounding the same, of an anchor for said strap connected theretocentrally between its ends and movable towards or from the axis of thehead, means for yieldably drawing said anchor away from said head, andmeans for guiding said anchor to prevent angular movement thereof, and

for receiving the thrust therefrom comprising par'allel laterallyextending bearings upon opposite sides of the anchor.

3. The combination with a revoluble brake head and a brake strapsurrounding-the same of an anchor connected to said brake strap, a rockarm connected to said anchor and movable in a plane at right angles tothe plane of rotation towards and'from the axis of said head, and astationary bearing for pr'eventing lateral movement of said rock arm,and for receiving the thrust transmitted therethrough.

4. The combination with a rotary brake head and abrake strap surroundthe same, of an anchorconnected to said bra e strap, a rock armconnected to said anchor and movable in a plane transverse to the planeof rotation, towards or from the axis 0 said head, and stationarycheek-plates embracing said rock arm for guiding the same, and receivingthe thrust therefrom.

5. The combination with a revoluble brake head and a brake strapsurrounding the same of an anchor connected to said brake strap, a

plane of rotation, a stationary bearing for guiding said rock arm, a,shank on said anchonextending radially from said head, a guide bearingfor said shank, and aspring' sleeved upon said shank for yieldablyactuating the same away from said head,

In testimony whereof I aflix my signature in presence of two witnesses.

HOWARD E. COFFIN.

WVitnesses CHAs. D. HAs'rINos, OHAs. P. MILLER.

